Talk Morgan Forums Thread Like Summary - Relay needed to wire fog lights on a '65 Plus 4?

Hi all,

Getting ready to wire the fog lights that I recently installed on my 1965 Plus 4..

I'm installing these Lucas replicas from Moss Motors.

I was able to locate the red/yellow trace wire that runs from the dash toggle to the front of the car (it is currently disconnected from the dash). When looking at the factory wiring diagram, it appears the hot (red/yellow trace) wire from the toggle is simply split with a snap connector and then connected to the foglamps (which I plan to ground to the chassis.)

I plan to add a 10 amp inline fuse to the hot (red/yellow trace) wire before the snap connector...question is, do I need a relay as well?

Looks like the factory didn't even fuse the foglamps - is a 10 amp inline fuse sufficient protection?

I know that a relay is often recommended - but it seems that's the case for more modern, electrically demanding, Morgans.

Any advice is appreciated.

That relay chosen should be fine Crowbar. Also you can ignore Doug's otherwise valid comment as it's not a diode relay and doesn't need to be for your age of car. Battery polarity is irrelevant therefore.

I would disconnect the wire to fog lamps at relay pin 87. Operating your fog lamp switch then you should just hear the relay click. If this is the case you have a short to ground on the live feed to fog lamps. Carefully trace the power feed after relay to find it, maybe disconnecting at fog lamps. FWIW I would suspect issue is in one or other of fog lamps themselves - a continuity tester would reveal. Once sorted replace feed wire to relay pin 87 and change fuse to 15 amp. Do not go above 20 amp!